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If there are no other symptoms and you feel otherwise well, you may want to consider hydration and rest to observe for some time. However, if you are having other symptoms such as those highlighted above, or if the thirst/ gastric symptoms persist or progresses, you should have a physical review with a doctor. One of the tests they may consider is a fasting blood glucose test. So if you do proceed for a review, try to see them early in the morning and fast for 8 hours from the night before (avoid oral food/drink intake apart from plain water) in case they assess you and determine that you may need to go for testing.